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At what aperture do I use an ERF Energy Rejection Filter for solar imaging?

by Altair Support | Aug 18, 2020

ERFs are used for 2 main reasons. Improved image quality, by reducing heat buildup and hot air currents inside your telescope and by keeping your Hydrogen Alpha or Calcium filter at a stable constant temperature, it keeps it “on-band” – Etalons of...

Can filters be placed in front of a focal reducer flattener?

by Altair Support | Aug 18, 2020

While many focal reducers and flatteners are threaded to accept filters, or to connect to M48 accessories, generally, putting a filter in front of the reducer or flattener optics is not recommended for two reasons. Firstly, it tends to cause optical aberrations,...

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